8Mb 3.3V Industrial 40MHz SPI EXCELON™ F-RAM in 8-pin SOIC The CY15B108QN-40SXI is an 8-Mb EXCELON™ LP ferroelectric RAM (F-RAM) with a high-speed SPI interface, organized as 1024K × 8 and supporting up to 40 MHz operation. It operates from 1.8 V to 3.6 V across an industrial temperature range of –40°C to +85°C.